I have CA'd wire into inner rod many times. I just rough up about 1" of the end, add Medium CA to the hole in the rod, and insert the rod (quickly, you only get one chance!)

Others will say that this is a formula for disaster, but for most 40 - 60 size planes, you shouldn't have a problem. I have used this method on some fairly aerobatic planes, I wouldn't use it for everything, but it works just fine for many applications.